Ever wonder why they're blue? Deception, really. Glacial ice goes through hundreds and thousands of years of freezing and compression. This compression causes air to remove itself from the ice. Air bubbles create a scattering effect when light passes through it. When the ice is devoid of these air bubbles, light may pass through undisturbed, and as light passes, all the colors of the spectrum, save blue, are effectively absorbed. This creates the illusion that the ice is blue. Another "cool" thing is that this ice melts six times slower than that of freezer box ice. Now, throw that in your rum and coke...

Sunset over the Great Salt Lake, taken from the Bountiful Wasatch Bench. The lake provides beautiful reflections of the light and colors of sunsets while the mountains provide an excellent vantage point.